/*
 * @(#)DefaultModule.java   0.3-3 06/05/2001
 *
 *  This file is part of the HTTPClient package
 *  Copyright (C) 1996-2001 Ronald Tschal�r
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA 02111-1307, USA
 *
 *  For questions, suggestions, bug-reports, enhancement-requests etc.
 *  I may be contacted at:
 *
 *  ronald@innovation.ch
 *
 *  The HTTPClient's home page is located at:
 *
 *  http://www.innovation.ch/java/HTTPClient/
 *
 */

package org.everrest.http.client;

import org.everrest.core.util.Logger;

import java.io.IOException;
import java.net.ProtocolException;

/**
 * This is the default module which gets called after all other modules have
 * done their stuff.
 *
 * @author Ronald Tschal�r
 * @version 0.3-3 06/05/2001
 */
class DefaultModule implements HTTPClientModule {
    /** number of times the request will be retried */
    private int req_timeout_retries;

    private static final Logger log = Logger.getLogger(DefaultModule.class);

    // Constructors

    /** Three retries upon receipt of a 408. */
    DefaultModule() {
        req_timeout_retries = 3;
    }

    // Methods

    /** Invoked by the HTTPClient. */
    public int requestHandler(Request req, Response[] resp) {
        return REQ_CONTINUE;
    }

    /** Invoked by the HTTPClient. */
    public void responsePhase1Handler(Response resp, RoRequest req) {
    }

    /** Invoked by the HTTPClient. */
    public int responsePhase2Handler(Response resp, Request req) throws IOException {
      /* handle various response status codes until satisfied */

        int sts = resp.getStatusCode();
        switch (sts) {
            case 408: // Request Timeout

                if (req_timeout_retries-- == 0 || req.getStream() != null) {
                    if (log.isDebugEnabled())
                        log.debug("Status " + sts + " " + resp.getReasonLine()
                                  + " not handled - maximum number of retries exceeded");

                    return RSP_CONTINUE;
                } else {
                    if (log.isDebugEnabled())
                        log.debug("Handling " + sts + " " + resp.getReasonLine() + " - resending request");

                    return RSP_REQUEST;
                }

            case 411: // Length Required
                if (req.getStream() != null && req.getStream().getLength() == -1)
                    return RSP_CONTINUE;

                try {
                    resp.getInputStream().close();
                } catch (IOException ioe) {
                }
                if (req.getData() != null)
                    throw new ProtocolException("Received status code 411 even" + " though Content-Length was sent");

                if (log.isDebugEnabled())
                    log.debug("Handling " + sts + " " + resp.getReasonLine()
                              + " - resending request with 'Content-length: 0'");

                req.setData(new byte[0]); // will send Content-Length: 0
                return RSP_REQUEST;

            case 505: // HTTP Version not supported
                return RSP_CONTINUE;

            default:
                return RSP_CONTINUE;
        }
    }

    /** Invoked by the HTTPClient. */
    public void responsePhase3Handler(Response resp, RoRequest req) {
    }

    /** Invoked by the HTTPClient. */
    public void trailerHandler(Response resp, RoRequest req) {
    }
}
